Title:
音響信号の階層符号化方法及び復号化方法
Document Type and Number:
Japanese Patent JP3559488
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the effects of a transmission error or packet loss by deforming an error spread over hierarchies, in bit rate scalable encoding and decoding, based on hierarchical quantization such as controlling of an amplitude. SOLUTION: A signal, deformed into input signal by a first deformation function, is inputted to the quantizer of the first hierarchy, a quantized code and a signal reconstituted by inverse quantization are outputted, the error signal calculator of the first stage outputs an error d1 (f) between the input signal and the signal reconstituted on the first stage, the quantizer of the next hierarchy inputs a signal deformed into error signal d1 (f) by a second deformation function and outputs the quantized code of that hierarchy and the signal reconstituted by inverse quantization, the error signal calculator of the second stage outputs an rear d2 (f) between the sum of the signal reconstituted on the first hierarchy, and the signal reconstituted on the second hierarchy and the input signal and the errors deformed on the high-order hierarchies, are similarly successively quantized on multiple stages.
Inventors:
Takehiro Moriya
Naoki Iwakami
Takeshi Mori
Akio God
Naoki Iwakami
Takeshi Mori
Akio God
Application Number:
JP2000037418A
Publication Date:
September 02, 2004
Filing Date:
February 16, 2000
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G10L19/038; G10L19/00; H03M7/30; H04B14/04; (IPC1-7): H03M7/30; G10L19/00; H04B14/04
Domestic Patent References:
| JP11186911A | ||||
| JP9322160A |
Attorney, Agent or Firm:
Taku Kusano
Minoru Inagaki
Minoru Inagaki